On part 2 of the Girls' Generation special, it was Tiffany's turn to ask the 'Knowing Brothers' crew a question, and she started, "At Sooyoung's birthday party, I was trying to make her laugh, and there was a big mishap." The guesses were all over the place, so Tiffany gave the hint that it was when she tried to stick a piece of fruit on her teeth.

Seo Jang Hoon guessed correctly, and Tiffany explained she tried to put a frozen blueberry on her front teeth to make it look as if they were missing to make Sooyoung laugh. Kang Ho Dong asked, "Your teeth aren't 100% yours?" She responded, "Yes, I changed it."